Willis China Rated Best for Quality Service

China Insurance Regulatory Commission in Shanghai Assigns Global
BrokerTop Rating in Quality Review for the Second Year Running

London, UK, August 27, 2009 — Willis Group Holdings (NYSE: WSH), the global insurance broker, announced today
that it has once again received the top five-star rating in the China Insurance Regulatory Commission’s
(CIRC) review of the quality of licensed insurance brokers operating in Shanghai in 2008.

Of the 70 brokers assessed by the CIRC, only 15 were awarded five stars, with Willis achieving
the highest number of points and first place overall. This is the second year in a
row that Willis China has been awarded the top five-star rating.

The CIRC evaluated intermediaries in a 360° process that included peer review by insurance companies, clients and
other brokers, in addition to the CIRC's own assessment. Based on this input, companies were then
awarded points on their management, integrity, service delivery, quality of work, premium processing and value-added services,
including claims.

Mitchell Ma, CEO, Willis China, said, “We are proud to be recognised for delivering consistently outstanding service
to our clients. This award is a testament to the quality of our people and the
dedication they show in providing our clients with the best service available. It also reflects our
successful investments in broking technology and in the establishment of an operations centre in Shanghai, both
of which have driven increased back-office efficiency while freeing up our client-facing staff to focus even
more of their time and energy on clients.”

In 2004, Willis purchased a 50 percent equity stake in Shanghai Pudong Insurance Brokers Ltd., a leading
Chinese insurance broker. In 2005, Willis increased its stake in the Willis Pudong Insurance Brokers Ltd
joint venture to 51 percent, making it the first foreign-controlled broker in China. In 2007, the
company name became Willis Insurance Brokers Co. With its extensive network of 20 licensed offices throughout
the country and more than 225 Associates, Willis has the largest local network and workforce of
all the global brokers in China.

Willis Group Holdings Limited is a leading global insurance broker, developing and delivering professional insurance, reinsurance, risk
management, financial and human resource consulting and actuarial services to corporations, public entities and institutions around
the world. Willis has more than 400 offices in nearly 120 countries, with a global team
of approximately 20,000 Associates serving clients in some 190 countries. Additional information on Willis may be
found at www.willis.com.